One Week Friends was most definitely a ‘feels’ kind of anime, and the opening theme made this clear from the get-go. The artist Natsumi Kon tends to perform more serious and loud songs, so the more calm and emotional feel of “Niji no Kakera” sticks out to me amongst her repertoire. I especially enjoy at 0:21 when the main instrumentation joins in with her voice, the moment created sort of feels like a door is being opened to a kind of melancholy but at the same time joyful sense.